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Rename zero_realloc option "strict" to "alloc".

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With realloc(ptr, 0) being UB per C23, the option name "strict" makes less sense
now.  Rename to "alloc" which describes the behavior.
This commit is contained in:
Qi Wang
2022-04-15 12:17:59 -07:00
committed by Qi Wang
parent 5841b6dbe7
commit 0e29ad4efa
7 changed files with 16 additions and 16 deletions
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6
doc/jemalloc.xml.in
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@@ -1580,19 +1580,19 @@ malloc_conf = "xmalloc:true";]]></programlisting>
</term>
<listitem><para> Determines the behavior of
<function>realloc()</function> when passed a value of zero for the new
size. <quote>strict</quote> treats this as an allocation of size zero
size. <quote>alloc</quote> treats this as an allocation of size zero
(and returns a non-null result except in case of resource exhaustion).
<quote>free</quote> treats this as a deallocation of the pointer, and
returns <constant>NULL</constant> without setting
<varname>errno</varname>. <quote>abort</quote> aborts the process if
zero is passed. The default is <quote>strict</quote>.</para>
zero is passed. The default is <quote>alloc</quote>.</para>
<para>There is considerable divergence of behaviors across
implementations in handling this case. Many have the behavior of
<quote>free</quote>. This can introduce security vulnerabilities, since
a <constant>NULL</constant> return value indicates failure, and the
continued validity of the passed-in pointer (per POSIX and C11).
<quote>strict</quote> is safe, but can cause leaks in programs that
<quote>alloc</quote> is safe, but can cause leaks in programs that
expect the common behavior. Programs intended to be portable and
leak-free cannot assume either behavior, and must therefore never call
realloc with a size of 0. The <quote>abort</quote> option enables these